Bug Render Texture is black

Good afternoon.
I'm trying to get a Render Texture by GetTemporaryRT.
However, a black texture is returning to me.

The console shows:

Code (CSharp):

1. CommandBuffer: temporary render texture _CameraFrameBuffer not found while executing PostProcessing (SetGlobalTexture)
2. UnityEngine.Rendering.ScriptableRenderContext:Submit()
3. CameraRenderer:Submit() (at Assets/MagicByte/Runtime/CameraRenderer.cs:116)
4. CameraRenderer:Render(ScriptableRenderContext, Camera, Boolean, Boolean, ShadowSettings, PostProcessingAsset) (at Assets/MagicByte/Runtime/CameraRenderer.cs:78)
5. MagicByteRenderPipeline:Render(ScriptableRenderContext, Camera[]) (at Assets/MagicByte/Runtime/MagicByteRenderPipeline.cs:23)
6. UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Codes:

Code (CSharp):

1. CameraClearFlags flags = camera.clearFlags;
2.  
3.         PostProcessingCamera PPC = camera.GetComponent<PostProcessingCamera>();
4.         if (PPC)
5.         {
6.  
7.             postStack.Setup(context, camera, ppAsset);
8.  
9.             if (flags > CameraClearFlags.Color)
10.             {
11.                 flags = CameraClearFlags.Color;
12.             }
13.  
14.             buffer.GetTemporaryRT(frameBufferId, camera.pixelWidth, camera.pixelHeight, 32, FilterMode.Bilinear, RenderTextureFormat.Default);
15.             buffer.SetRenderTarget(frameBufferId, RenderBufferLoadAction.DontCare, RenderBufferStoreAction.Store);
16.  
17.             PPC.OnRenderCamera();
18.             postStack.PostProcessingDrawing(frameBufferId, BuiltinRenderTextureType.CameraTarget, PPC.OnRenderTone(), 0, buffer);
19.  
20.         }
21.  
22.         DrawGizmos();
23.         Cleanup();
24.         Submit();
25.     }

Code (CSharp):

1. void Cleanup()
2.     {
3.         lighting.Cleanup();
4.         buffer.ReleaseTemporaryRT(frameBufferId);
5.     }

PostFXStack Script:

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.Rendering;
3.  
4. public partial class PostProcessingStack
5. {
6.  
7.     const string bufferName = "PostProcessing";
8.     int fxSourceId = Shader.PropertyToID("_PostFXSource");
9.     CommandBuffer buffer = new CommandBuffer
10.     {
11.         name = bufferName
12.     };
13.  
14.     ScriptableRenderContext context;
15.  
16.     Camera camera;
17.  
18.     PostProcessingAsset settings;
19.     public bool IsActive = true;
20.  
21.     public void Setup(
22.         ScriptableRenderContext context, Camera camera, PostProcessingAsset settings
23.     )
24.     {
25.         this.context = context;
26.         this.camera = camera;
27.         this.settings = camera.cameraType <= CameraType.SceneView ? settings : null;
28.  
29.     }
30.  
31.     public void PostProcessingDrawing(int sourceId, RenderTargetIdentifier to, Material material, int pass, CommandBuffer cmd)
32.     {
33.         Drawing(sourceId, to, material, pass, cmd);
34.         context.ExecuteCommandBuffer(buffer);
35.         buffer.Clear();
36.     }
37.  
38.     void Drawing(RenderTargetIdentifier from, RenderTargetIdentifier to, Material material, int pass,CommandBuffer cmd)
39.     {
40.         cmd.SetGlobalTexture(fxSourceId, from);
41.         buffer.SetRenderTarget(to, RenderBufferLoadAction.DontCare, RenderBufferStoreAction.Store);
42.         if(settings != null)
43.         buffer.DrawProcedural(Matrix4x4.identity, material, pass,MeshTopology.Triangles, 3);
44.     }
45. }

Shader (Vertex and Pixel):

Code (CSharp):

1. Shader "Hidden/TonemappingShader"
2. {
3.     Properties
4.     {
5.         //_MainTexCamera ("Texture", 2D) = "white" {}
6.     }
7.     SubShader
8.     {
9.         Tags { "RenderType"="Opaque" }
10.  
11.         ZTest Always Cull Off ZWrite Off
12.  
13.         HLSLINCLUDE
14.         #include "../ShaderLibrary/Common.hlsl"
15.         ENDHLSL
16.  
17.         Pass
18.         {
19.             HLSLPROGRAM
20.             #pragma target 3.5
21.             #pragma vertex DefaultPassVertex
22.             #pragma fragment frag
23.  
24.             #include "../ShaderLibrary/UnityInput.hlsl"
25.  
26.             TEXTURE2D(_PostFXSource);
27.             SAMPLER(sampler_PostFXSource);
28.  
29.             struct appdata
30.             {
31.                 float4 vertex : POSITION;
32.                 float2 uv : TEXCOORD0;
33.             };
34.  
35.             struct Varyings {
36.                 float4 positionCS : SV_POSITION;
37.                 float2 fxUV : VAR_FX_UV;
38.             };
39.  
40.             Varyings DefaultPassVertex(uint vertexID : SV_VertexID) {
41.                 Varyings output;
42.                 output.positionCS = float4(
43.                     vertexID <= 1 ? -1.0 : 3.0,
44.                     vertexID == 1 ? 3.0 : -1.0,
45.                     0.0, 1.0
46.                     );
47.                 output.fxUV = float2(
48.                     vertexID <= 1 ? 0.0 : 2.0,
49.                     vertexID == 1 ? 2.0 : 0.0
50.                     );
51.                 if (_ProjectionParams.x < 0.0) {
52.                     output.fxUV.y = 1.0 - output.fxUV.y;
53.                 }
54.                 return output;
55.             }
56.  
57. float4 GetSource(float2 fxUV) {
58.     return SAMPLE_TEXTURE2D(_PostFXSource, sampler_PostFXSource, fxUV);
59. }
60. float4 frag (Varyings i) : SV_Target
61. {
62.  
63.                 float4 color = GetSource(i.fxUV);
64.  
65.                 float3 hsv = RGBtoHSV(color.rgb);
66.                 hsv.x = gmod(hsv.x + _HSV.x, 1.0);
67.                 hsv.yz *= _HSV.yz;
68.                 color.rgb = saturate(HSVtoRGB(hsv));
69.  
70.                         if (_Tone == 1) color.rgb = linearT(color.rgb);
71.                         if (_Tone == 2) color.rgb = simpleReinhard(color.rgb);
72.                         if (_Tone == 3) color.rgb = lumaBasedReinhard(color.rgb);
73.                         if (_Tone == 4) color.rgb = Photographic(color.rgb);
74.                         if (_Tone == 5) color.rgb = whitePreservingLuma(color.rgb);      
75.                         if (_Tone == 6) color.rgb = filmic(color.rgb);
76.                         if (_Tone == 7) color.rgb = ACESFilm(color.rgb);
77.                         if (_Tone == 8) color.rgb = Gray(color.rgb);
78.  
79.                 color.rgb = pow(color.rgb,_Gamma);
80.  
81.                 half3 lms = mul(LIN_2_LMS_MAT, color.rgb);
82.                 lms *= _WhiteBalance;
83.                 color.rgb = mul(LMS_2_LIN_MAT, lms);
84.  
85.                 color.rgb = saturate((color.rgb - 0.5) * _Contrast + 0.5);
86.  
87.                 return color;
88.             }
89.             ENDHLSL
90.         }
91.     }
92. }
93.  

 

I fixed the problem by changing GetTemporaryRT to preRender the camera.